Core frame



G. WALTHER.

CORE FRAME.

APPLICATION FILED NOV. 17. 1919.

1,404,250. I Patented Jan. 24, 1922.

3 SHEETS-SHEET I.

runnm LJULTULF IN V EN TOR. George T/VZZLfZ/ "MUM A 'ITORNE Y5 G. WALTHER.

CORE FRAME. APPMCATION man NOV- 17 1919. 1,404,250. Patented Jan. 24, 1922.

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G. WALTHER. CORE FRAME.

APPLICATION FILED NOV- 11, 1919.

1,404,250. I Patented Jan. 24, 1922.

3 SHEETS-SHEET 3- Q m \r JNVENWR George Wa/hher,

A TTORN[Y5 UNITED STATES PATENT OFFICE.

GEORGE WALTHER, OF DAYTON, OHIO.

GORE FRAME.

Specification of Letters Patent.

Patented Jan. 24, 1922.

Application filed .November 17, 1919. Serial No.- 338,556.

To all whom it may comm:

Be it known that I, GEORGE WVALrHER, a citizen of the United :States, residing at Dayton, in the county of Montgomery and State-of OlllO,1l1iLV6; invented certain new anduseful Improvements in Core Frames, of

which the followingisa specification, referencebeing had therein to the accompanying drawing.

Thisinvention relates .to core supports and improved method vof. molding cast wheels and hasfor its particular object to provide .a core frame and arbor adapted to hold the sand or other material of which the core ismade intact and tosupport the core in proper relationto the mold and also where a plurality of cores are used, to support the cores .in proper relation to each other.

hly invention as here shown is adapted especially in casting truck wheels havlng hollow spokes of the general type shown in Patent No. 1,120,256, issued tome Deing in casting wheels of this character consist, first, in uniformity of the castings with respect to the hollow castspokes and,

second, in cheapness of production,'the work offormmg the cores, arranging the cores in the mold and removing. the cores from the casting being relatively shortened; also the loss in defective castings is materially reduced.

In the accompanying drawings;

' Fig. l is a plan view of a wheel casting as it is removed from the-mold showing the core supporting frame and one ofthe cores in position, a portion of the wheel being broken away;

Fig. 2 is a cross sectional view of the wheel and core parts shown in Fig. 1, taken on the line 2-2 of Fig. 1;

Fig. 3 is a cross sectional view of the core frame and the central core supported thereby, and showing 'a preferred arrangement for handling the core structure and adjusting the same in the mold flask;

Fig. 4 is a cross sectional view of the complete flask having the core structure in position therein; and

Fig. 5 is a detail of the locking wedge for holding the dry core in position relative to the core frame.

As shown in Fig. l of the drawings the truck wheel, in connection with which my invention is here shown, consists of an integral casting having a hub l, felly 2 and a plurality of hollow spoke 3. The novel featuresof this wheel are described in detail in the patent above referred to, but the same do not form a part of the present invention, reference being made thereto only in general terms to explain the application of the invention .in casting the wheel. I

In the use of the invention in the form here shown the usual mold flask, consisting of the drag 4 and cope 5, is used, and any suitable pattern may be used to form the mold for the wheel casting, the part in the mold being made sufficiently high, preferably to permit the greater part of the core print to lie within the mold depression formed in the drag.

,The cores 6, as here shown, are made of the usual material and are formed on a core arbor or support 7, a separate supportbeingused for each core, and the supports be ,ing secured to a core supporting frame, here shown in the form of a circular rim 9, and spacedv apart and arranged radially relative to the position of the spokes.

The core supports may be secured to the frame 9 in any suitablemanner to provide for. the rigid support of the cores thereon and for the convenient removal of the cores and core supports after the casting is made. As here shown the core supports are pro- .vided with a base 8 adapted to fit in the curvature of. the run, the rim and base belng drilled to recelve one or more dowel pins 10 to hold the core support in fixed relation to the frame, thereby supporting the core in relatively fixed relation to the mold for the spoke.

The cores are made in the usual manner by forming the core sand about the core arbors,.the cores formed on the arbors being what is known in the trade as green sand cores. In addition to these green sand cores a dry sand core 11 is used to form the hollow portion of the hub and serving also as an anchor or support for the free end of the core arbors 7 as shown in Fig. 4 of the drawings; the dry sand core being supported in the mold in the usual manner by a plurality of chaplets 12. Thus the com.- plete core structureincluding the supporting frame 9 and the green and dry cores maybe handled and adjusted relative to the mold as a single core. It is obvious, however, that the core frame may consist of separate parts, made up in segments, one for each spoke or several spokes as may be desired and adjusted to the mold accordingly.

As here shown the frame 9 is provided with dowels 13 on opposite sides of its center. Angular-core lining plates 14 are used in connection with these pins to properly locate the cores relative to the mold and the upper and lower members of the flask, respectively. To this end the plates 14 have apertures 15 formed in the lower extension thereof and an aperture 16 formed in the other extension thereof. The lining plates may thus be detachably secured to the frame 9 by means of the dowels 13, and the frame together with the cores supported thereby may then be adjusted or lined relative to the drag by bringing the apertures 16 into. alinement with holes l'i/in ears or projections 18 extending outwardly from the drag frame, thealinement being made with a suitable pin or bolt 19 passed through the holes of the coacting parts when the same are brought to register. lVith the alinement of the cores relative to the mold and flask thus made the plates 14 are removed and the upper member of the flask, or cope is brought into position and alined with the lower member by introducing a lining bolt 19 through a hole 20 in an ear 21 of the cope and the hole 17 of the ears '18 of the drag when the Same have been brought to register.

When the casting is made the dowel pins 10 are driven back, the rim 9 drops free of the casting, and the core supports 7 together with the sand forming the core may then be freely withdrawn from the hollow spaces formed in the spokes.

I do not claim this principle of forming and supporting the cores as broadly new in the art, but in the improved form here shown .and in the casting of wheels both the con- I struction shown and the method of using the same as far as I am aware, are new.

In Fig. 3 of the drawings I have shown a preferred arrangement for handling the core structure and adjusting the same relative to the mold flask. To this end a wide board 22 is employed, the board being of sufficient length to have its ends extend a considerable distance over the edge of the core rim 9 when the board is secured thereto in the manner shown, consisting in placing the board flat upon the rim'and fastening the same to the opposite lining plates 1 f by means of bolts 19. Thus the entire core structure may be support the core relative to the board 22 to handled by two men by lifting the same from the opposite ends of the board 22.

In view of the size and weight of the dry sand core 11 it has been found desirable to prevent sagging or lowering of the core by its own weight which may cause the core to collapse. 1T0 thisend the board 22 is provided with a suitable aperture 24 in which is supported by means of a wedge 25a loop or conical shaped spring 26 having'its opposite ends 26-26 expanding outwardly to engage the lower edge of'the core 11, thus 'preventing movement of the core relative to the 7 board. When the core structure is set 1n position in the mold flask the wedge 25 is removed and the bolts 19 are withdrawn. The board 22 may then be removed from the rim 9, and the spring 26 from the core 11 by compressing the spring:

Having thus full described myinvention whatI claim as new and desire to secure by Letters Patent, is

Y 1. In a device of the character described, the combination, with a mold flask for casting'an integral wheel having a plurality of hollow spokes, means for forming the mold impression for said wheel, a frame :positioned relative to said flask and having a corresponding pluralityof core supports secured thereto, a core formed about each of said supports and positioned thereby relative to the mold impression to form the hollow portion of one of said spokes when. said wheel is cast.

2. In a device of the character described, the combination, with a'mold flask for easting an integral wheel having a pluralityof hollow spokes, meansfor forming the'mold impression 1 for said wheel, a frame .positioned relative to said flask and having a corresponding plurality of: core supports detachably secured theret'o, a core formed about each of said supports and positioned thereby relative to the mold impression to form the hollowwportion of one of said 1 spokes when said wheel is cast, and means to release the core supports fromsaid frame when the casting is made andto remove the cores and said supports from the hollow spaces formed thereby in said spokes.

3. In a device ofthe character described, the combination, with a mold flask for casting an integral Wheel having a plurality. ofhollow spokes, means forforming the mold impression for said Wheel, a circular rim positioned relative to said flask and having a corresponding plurality ofcore supports detachably secured thereto by dowels, a core formed about each of said supports and positioned thereby relative to the mold impression to form the hollow portion of one of said spokes when said wheel is cast, means to permit of driving said dowels inwardly when the castingis formed to release said rim and to provide for the removal of the cores and core supports from the hollow spaces formed in said spokes.

4. In a device of the character described, the combination, with a mold flask for casting an integral wheel having a plurality of hollow spokes, means for forming the mold impression for said wheel, a frame positioned relative to said flask and having a corresponding plurality of core supports secured thereto, a core formed about each of said supports and a core common to all of said cores and positioned therewith relative to the mold impression whereby the hollow portions of the hub and spokes of said wheel will be formed.

5. Ina device of the character described, the combination, with a mold flask for easting an integral wheel having a plurality of hollow spokes, means for forming the mold impression for said wheel, a frame posit-ioned relative to said flask and having a corresponding plurality of core supports secured thereto, a green core formed about each of said supports and a dry core common to all of said supports and acting to support the free ends thereof, whereby the hollow portions of the hub and spokes of said wheel will be formed.

6. In a device of the character described, the combination, with a mold flask for casting an integral wheel having a plurality of hollow spokes, means for forming the mold impression for said wheel, a frame positioned relative to said flask and having a corresponding plurality of core supports secured thereto, a core formed about each of said supports and positioned thereby relative to the mold impression to form the hollow portion of one of said spokes, and means to locate said cores relative to the mold and the mold flask.

7. In a device of the character described, the combination, with a mold flask for casting an integral wheel having a pluralityof hollow spokes, means for forming the mold impression for said Wheel, a frame positioned relative to said flask and having a corresponding plurality of core supports secured thereto, a core formed about each of said supports and a core common to all of said cores and positioned therewith relative to the mold impression whereby the hollow portions of the hub and spokes of said wheel will be formed, and means for handling the core structure and for securing the central core relative thereto.

8. In a device of the character described, the combination, with a mold flask for casting an integral wheel having a plurality of hollow spokes, means for forming the mold impression for said wheel, a frame positioned relative to said flask and having a corresponding plurality of core supports secured thereto, a core formed about each of said supports and positioned thereby relative to the mold impression to form the hollow portion of one of said spokes, and means secured to the core supporting frame whereby the same may be handled and adjusted relative to the mold flask.

In testimony whereof, I aflix my signature.

' GEORGE WALTHER. 

